feat(UI): add package counter to repo/user/org overview pages

- add package counter to repo/user/org overview pages
    - add go unit tests for repo/user has/count packages
    - add many more unit tests for packages model
    - fix error for non-existing packages in DeletePackageByID and SetRepositoryLink

templates/org/menu.tmpl

@@ -20,6 +20,10 @@
 			{{if and .IsPackageEnabled .CanReadPackages}}
 			<a class="{{if .IsPackagesPage}}active {{end}}item" href="{{$.Org.HomeLink}}/-/packages">
 				{{svg "octicon-package"}} {{ctx.Locale.Tr "packages.title"}}
+				{{if .PackageCount}}
+					<div class="ui small label">{{.PackageCount}}</div>
+				{{end}}
+				<span hidden test-name="package-count">{{.PackageCount}}</span>
 			</a>
 			{{end}}
 			{{if and .IsRepoIndexerEnabled .CanReadCode}}

templates/repo/header.tmpl

@@ -135,6 +135,9 @@
 				{{if .Permission.CanRead $.UnitTypePackages}}
 					<a href="{{.RepoLink}}/packages" class="{{if .IsPackagesPage}}active {{end}}item">
 						{{svg "octicon-package"}} {{ctx.Locale.Tr "packages.title"}}
+						{{if .NumPackages}}
+							<span class="ui small label">{{CountFmt .NumPackages}}</span>
+						{{end}}
 					</a>
 				{{end}}
 

templates/user/overview/header.tmpl

@@ -24,6 +24,10 @@
 		{{if and .IsPackageEnabled (or .ContextUser.IsIndividual .CanReadPackages)}}
 			<a href="{{.ContextUser.HomeLink}}/-/packages" class="{{if .IsPackagesPage}}active {{end}}item">
 				{{svg "octicon-package"}} {{ctx.Locale.Tr "packages.title"}}
+				{{if .PackageCount}}
+					<div class="ui small label">{{.PackageCount}}</div>
+				{{end}}
+				<span hidden test-name="package-count">{{.PackageCount}}</span>
 			</a>
 		{{end}}
 		{{if and .IsRepoIndexerEnabled (or .ContextUser.IsIndividual .CanReadCode)}}